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Equipment for measuring electrical quantities of one phase of ac current in overhead electrical networks

A technology of electrical network and AC current, applied in the direction of measuring current/voltage, measuring electrical variables, using digital measurement technology to measure, etc., can solve the problem that the measurement is not always reliable

Active Publication Date: 2020-09-15
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, measurements of electrical quantities made by this sensor are not always reliable

Method used

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  • Equipment for measuring electrical quantities of one phase of ac current in overhead electrical networks
  • Equipment for measuring electrical quantities of one phase of ac current in overhead electrical networks
  • Equipment for measuring electrical quantities of one phase of ac current in overhead electrical networks

Examples

Experimental program
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Embodiment Construction

[0044] figure 1 A device 1 for measuring an electrical quantity of a phase of an AC current of an overhead electrical network 2 is shown.

[0045] Network 2 is configured to carry AC current. For example, Network 2 is a medium voltage electrical distribution network. In this example, the AC current is a three-phase current and has a frequency of 50 Hz. Alternatively, the current has a frequency of 60 Hz.

[0046] For example, the network 2 comprises three overhead wires 21, 22, 23 to carry respectively the three phases of the previously described three-phase AC current. It is assumed that these three lines 21, 22, 23 are identical. Therefore, only line 21 is described in detail below.

[0047] A line 21 electrically connects a power source 24 of the network 2 to an electric charge 25 to be powered. Source 24 generates AC current, and charge 25 consumes the current. The source 24 here comprises a high-voltage-medium voltage transformer. In a known manner, using a line i...

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PUM

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Abstract

The invention relates to a device (1') for measuring an electrical quantity (U) of a phase of an AC current in an overhead electrical network (2), comprising: sensors (3, 5) designed to be attached to A wire (21) of said overhead electrical network, said sensor (3, 5) comprising: a conductive plate (31, 51); an electrical conductor (32, 52) designed to electrically connect said plate to said wire , so that the first current from the wire (I 1 ) circulates through said electrical conductor; a processing unit designed to determine said electrical quantity from the value of said first current (h) and the value of the capacitance between said plate and ground (10). The device also comprises a generator (7) electrically connected to the electrical conductor and designed to inject a second current through the electrical conductor, the second current having a frequency different from the frequency of the first current , the processing unit is also designed to be based on the second current (I 2 ) to calculate the value of the capacitance between the plate and the ground.

Description

technical field [0001] The invention relates to a device for measuring the electrical quantity of a phase of an AC current of an overhead electrical network. The invention relates to a method of measuring such electrical quantities. Background technique [0002] In a known manner, there are sensors for measuring electrical quantities in overhead electrical networks, such as the phase voltages of the AC currents circulating in the network. By "overhead electrical network" is meant an electrical transmission network comprising at least one overhead wire (ie an electrical conductor extending above the ground and in contact with the surrounding air). [0003] An example of such a sensor comprises a metal plate arranged between overhead wires of an electrical network and the ground. This sensor makes it possible to measure the electrical quantity of the current flowing in the wire. [0004] However, the measurement of electrical quantities by this sensor is not always reliable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R29/12G01R31/52G01R31/58G01R31/08H04B3/46
CPCH04B3/46G01R27/2605G01R35/005G01R15/16G01R19/2506G01R31/085G01R29/12G01R15/165G01R19/2513
Inventor M.克莱门斯P.霍布勒E.康蒂尼
Owner SCHNEIDER ELECTRIC IND SAS